20919402 has 24 divisors (see below), whose sum is σ = 51800736. Its totient is φ = 5976936.

The previous prime is 20919383. The next prime is 20919419. The reversal of 20919402 is 20491902.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82888 + ... + 83139.

It is an arithmetic number, because the mean of its divisors is an integer number (2158364).

Almost surely, 2^20919402 is an apocalyptic number.

20919402 is an abundant number, since it is smaller than the sum of its proper divisors (30881334).

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

20919402 is a wasteful number, since it uses less digits than its factorization.

20919402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166042 (or 166039 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20919402 is about 4573.7732781589. The cubic root of 20919402 is about 275.5390067551.

It can be divided in two parts, 20919 and 402, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20919402 in words is "twenty million, nine hundred nineteen thousand, four hundred two".