20401624 has 8 divisors (see below), whose sum is σ = 38253060. Its totient is φ = 10200808.

The previous prime is 20401613. The next prime is 20401663. The reversal of 20401624 is 42610402.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275094 + ... + 1275109.

Almost surely, 2^20401624 is an apocalyptic number.

It is an amenable number.

20401624 is a deficient number, since it is larger than the sum of its proper divisors (17851436).

20401624 is a wasteful number, since it uses less digits than its factorization.

20401624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550209 (or 2550205 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20401624 is about 4516.8156924984. The cubic root of 20401624 is about 273.2466920846.

It can be divided in two parts, 20401 and 624, that added together give a square (21025 = 145²).

The spelling of 20401624 in words is "twenty million, four hundred one thousand, six hundred twenty-four".