20401902 has 32 divisors (see below), whose sum is σ = 46022400. Its totient is φ = 6697944.

The previous prime is 20401867. The next prime is 20401919. The reversal of 20401902 is 20910402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799 + ... + 6437.

It is an arithmetic number, because the mean of its divisors is an integer number (1438200).

Almost surely, 2^20401902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20401902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23011200).

20401902 is an abundant number, since it is smaller than the sum of its proper divisors (25620498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20401902 is a wasteful number, since it uses less digits than its factorization.

20401902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5717 (or 5711 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20401902 is about 4516.8464662860. The cubic root of 20401902 is about 273.2479331988.

The spelling of 20401902 in words is "twenty million, four hundred one thousand, nine hundred two".